CN102273250B - Method for monitoring downlink control channel in user equipments - Google Patents
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Abstract
A method for discontinuously monitoring downlink control channel in a user equipment in a wireless communication system includes receiving a discontinuous reception (DRX) Start Offset from a base station to be used for both a first DRX Cycle and a second DRX Cycle, and starting an On Duration Timer at a subframe that satisfies either a first condition for the first DRX Cycle or a second condition for the second DRX Cycle, wherein a first DRX offset used in the first condition is based upon the DRX Start Offset received from the base station, and wherein a second DRX offset used in the second condition is based upon a remainder of the DRX Start Offset received from the base station after a modulo operation by the second DRX Cycle.
Description
Technical field
The present invention relates to Long Term Evolution (LTE) system, or rather, relate to the method for monitoring downlink control channel in the subscriber equipment (UE) of wireless communication system.
Background technology
Fig. 1 shows the network configuration of the universal mobile telecommunications system (E-UMTS) of evolution.E-UMTS system is the evolution version of Wideband Code Division Multiple Access (WCDMA) (WCDMA) UMTS system, and its basic standardization is just carried out under third generation partner program (3GPP).E-UMTS is also referred to as LTE system.Version 7 and the version 8 of " third generation partner program, technical specification group wireless access network " are incorporated at this, and can be at length called the technical specification of UMTS and E-UMTS.
As shown in fig. 1, E-UMTS comprises subscriber equipment (UE), base station (or eNB or eNode B) and IAD (AG), it is positioned at the end of universal terrestrial access network (E-UTRAN) (not shown) of evolution, and it is connected to external network.
Conventionally, eNB can synchronously send the multiple data flow for broadcast service, multicast service and/or unicast services.AG can be divided into the part of the processing of processing customer service and the part of processing controls business.For the treatment of the AG part of new customer service with for the treatment of the AG part of service control, can use new interface to communicate with one another.For an eNB, can there are one or more communities.For the interface that sends customer service or service control, can between eNB, use.Core network (CN) can comprise AG and network node or similar, for the user of registered UE.Also can use the interface of distinguishing between E-UTRAN and CN.AG manages the mobility of UE on the basis of tracking area (TA).A TA comprises multiple communities.When UE moves to another TA from a specific TA, UE changes to the residing TA of AG notice UE.
Fig. 2 shows the network configuration of E-UTRAN system.E-UTRAN system is the evolution version of traditional UTRAN system.E-UTRAN comprises the base station that also will be called " eNode B " or " eNB ".ENB connects by X2 interface.Between eNB, define X2 user plane interface (X2-U) (not shown).X2-U interface provides the unsecured transmission of user plane packets data cell (PDU).Between two adjacent eNB, define X2 control plane interface (X2-CP) (not shown).X2-CP carries out various functions, is included in the background transmission (context transferring) between eNB, the control of the user-plane tunnel between source eNB and target eNB, the transmission of handover-related message, and uplink load management.
Each eNB is connected to UE by wave point, and by S1 interface, is connected to the block core (EPC) of evolution.Between eNB and gateway (S-GW) (not shown), define S1 user plane interface (S1-U) (not shown).S1-U interface provides the unsecured transmission of user plane PDU between eNB and S-GW.Between eNB and MME (Mobility Management Entity) (not shown), define S1 control plane interface (S1-MME) (not shown).S1 interface is carried out various functions, comprises EPS (enhancing grouping system) carrying SMF, NAS (Non-Access Stratum) signalling function, network sharing functionality and MME load-balancing function.
Fig. 3 shows the control plane of Radio interface protocols between E-UTRAN and UE and the structure of user plane according to 3GPP Radio Access Network standard.Radio interface protocols is flatly divided into physical layer, data link layer and network layer.Radio interface protocols is vertically divided into for the user plane of transfer of data with for the control plane of signaling.Based on extensive known open system interconnection (OSI) reference model lower three layers in communication system, the protocol layer of Fig. 3 can be divided into ground floor (L1 layer), the second layer (L2 layer) and the 3rd layer (L3 layer).Control plane is to transmit control message with the passage of administer calls by its UE and network.User plane is the passage that is sent in the data of application layer generation by it.The data that generate in application layer comprise speech data or internet packet data.By below to the control plane in Radio interface protocols and user plane layer be described in detail.
Physical layer as ground floor is used physical channel, is provided to the formation transfer service on upper strata.Physical layer is connected to media interviews control (MAC) layer being positioned at more than physical layer by transmission channel.By transmission channel, between MAC layer and physical layer, transmit data.By physical channel, carry out between different physical layers, especially the transfer of data between each physical layer of transmitter side and receiver side.Time and frequency are used as Radio Resource, with OFDM (OFDM) modulation physical channel.
The MAC layer of the second layer, by logic channel, provides the service to being positioned at wireless link control (RLC) layer more than MAC layer.The reliable transfer of data of rlc layer support of the second layer.By the internal functional blocks of MAC layer, also can implement the function of rlc layer, in this case, not need to exist independent rlc layer.PDCP (PDCP) the layer Executive Head compression function of the second layer, to reduce unnecessary control information, to effectively send IP grouping in the wave point with relatively narrow broadband, such as IPv4 or IPv6 grouping.
Only in control plane, definition is positioned at Radio Resource control (RRC) layer of Tipple Bottom portion, and radio resource control layer is responsible for controlling and the logic channel, transmission channel and the physical channel that configure, reconfigure and the version of radio bearer (RB) is relevant.RB is that the second layer provides the service for the data communication between UE and E-UTRAN.In order to realize this, the rrc layer of UE and the rrc layer of network exchange RRC message.If set up RRC between the rrc layer of wireless network and the rrc layer of UE, connect, UE is in RRC connection mode so.Otherwise UE is in RRC idle pulley.The Non-Access Stratum (NAS) being positioned at more than rrc layer is carried out the function that comprises conversation management functional and mobile management function.ENB Yi Ge community is configured such that and is used such as 1.25,2.5,5,10 or the broadband of 20MHz, so that down link or ul transmissions service are provided to UE.Different communities is configured such that with different broadbands.
The downlink transmission channel that data are sent to UE from network comprises for the broadcast channel (BCH) of transmitting system information, for sending the paging channel (PCH) of beep-page message and for sending the downlink sharied signal channel (SCH) of customer service or control message.By down link SCH, can send customer service or the control message of down link multicast or broadcast service.
Alternatively, by down link Multicast Channel (MCH), can send customer service or the control message of down link multicast or broadcast service.For the uplink transmission channels that data are sent to network from UE, comprise Random Access Channel (RACH) for sending initial control message and for sending the up link SCH of customer service or control message.
Logic channel is positioned at transmission channel above and is mapped to transmission channel.Logic channel comprises Broadcast Control Channel (BCCH), Paging Control Channel (PCCH), Common Control Channel (CCCH), multicast control channel (MCCH) and multicast service channel (MTCH).
Will be described below traditional discontinuous reception (DRX) method.DRX with when for determining that at eNB information of radio resource allocation to be sent to the operation of UE relevant.If UE monitors the downlink channel that transports information of radio resource allocation continuously, especially physical downlink control channel (PDCCH), causes power consumption.In order to prevent this problem, according to the pre-defined rule between UE and eNB, at the appointed time eNB sends to UE by information of radio resource allocation on PDCCH.In addition,, according to this pre-defined rule, receiver at the appointed time receives information of radio resource allocation on PDCCH.Because only need at the appointed time to monitor PDCCH according to DRX method UE, can reduce power consumption.
Will be described below DRX method of operation.In LTE system, two DRX cycles of for example long DRX cycle (cycle) and short DRX cycle are used to DRX operation.Can minimise data transmission delay according to the suitable use of the long DRX cycle of data transmission state and short DRX cycle, reduce the loss of battery electric power simultaneously.Activationary time refers to that UE wakes up and monitors the time such as the downlink channel of PDCCH.Particularly, activationary time comprises the time of dispatch request unsettled (pending).In addition,, about ul transmissions, activationary time comprises the time that can resend radio resource assignment message.Activationary time comprises the interim C-RNTI (T-C-RNTI) of distribution of Radio Resource or the time period of the reception of C-RNTI of indicating for initial transmission of receiving from RACH message 2 (MSG 2).After activationary time, UE does not need to monitor PDCCH.Activationary time comprises that unlatching duration timer (On Duration Timer), DRX deexcitation timer (DRX Inactivity Timer), DRX resend the running time of timer or competition solution timer.
Open duration timer and specify the number that starts continuous P DCCH subframe from the beginning of DRX cycle.DRX deexcitation timer specifies in PDCCH and is successfully decoded the number of continuous P DCCH subframe afterwards, and this PDCCH is UE indication initial uplink or downlink user data transmission.Once DRX resends timer and specifies UE to expect to resend, the maximum number of continuous P DCCH subframe.Competition solution timer specifies in message 3 (MSG 3) and is sent out number of the continuous subframes of UE monitoring PDCCH during it afterwards.
MSG 3 is that this uplink shared channel (UL-SCH) has community-Radio Network Temporary Identifier (C-RNTI) media interviews controls (MAC) control elements (CE) or Common Control Channel (CCCH) service data unit (SDU) in the upper message sending of uplink shared channel (UL-SCH).MSG 3 is submitted to from upper strata, and is associated with UE competition solution sign, as a part for random access procedure.
PDCCH subframe represents any subframe for the UE with Frequency Division Duplexing (FDD) (FDD) operation.On the other hand, PDCCH subframe only represents downlink subframe and subframe, comprises the down link pilot timeslot (DwPTS) for the UE with time division duplex (TDD) operation.
Summary of the invention
[technical problem]
When DRX function is set, in each Transmission Time Interval (TTI), UE operation is as follows.If short DRX cycle is used, and [(SFNx10)+subframe numbers] equals the DRX start offset cycle divided by the remainder of short DRX cycle, UE startup unlatching duration timer so.SFN represents System Frame Number.A system-frame consists of 10 subframes, and the reference of absolute time in SFNShi community.In addition,, if use long DRX cycle and [(SFNx10)+subframe numbers] to equal DRX start offset divided by the remainder of long DRX cycle, UE starts unlatching duration timer so.
If mixed automatic retransfer request (HARQ) two-way time (RTT) timer expires in current subframe, and the data that cushion in harq buffer device are not successfully decoded, and DRX resends timer and is activated so.When receiving DRX order, stop DRX MACCE, open duration timer and DRX deexcitation timer.At DRX deexcitation timer, expire or when receiving DRX order, DRX MAC CE, if be provided with short DRX cycle, UE starts DRX short cycle timer and uses short DRX cycle so.If short DRX cycle is not set up, UE is used long DRX cycle so.When DRX short cycle timer expires, UE is used long DRX cycle.
During activationary time, UE carries out following processing.UE monitoring PDCCH except the ul transmissions at half-duplex UE or in measurement clearance (measurement gap).When UE receiving downlink distributes or transports the subframe of configured downlink allocation, UE starts HARQ RTT timer and stops resending timer for the DRX of HARQ process.If PDCCH indicates initial transmission, UE starts or restarts DRX deexcitation timer so.
LTE system is used DRX start offset, divides the PDCCH monitoring period that is used in multiple UE.But, using for the single DRX start offset of long DRX cycle and short DRX cycle and may cause problem, this will below be described.
[technical solution]
Therefore, the present invention relates to the method for monitor downlink control channel at UE, the method has been eliminated the one or more problems that cause due to the restricted and shortcoming of correlation technique substantially.
Even if target of the present invention is to provide one when using multiple DRX cycles to carry out DRX operation, although use single DRX start offset, for making DRX operate reliable method.
Supplementary features of the present invention and advantage will be described below, and partly will from this description, become obviously, or can know from the practice of the present invention.By the structure particularly pointing out, can realize and reach object of the present invention and other advantage in write description and its claim and accompanying drawing.
In order to realize these and other advantages and according to object of the present invention, as extensive description and embody, for comprising in the method for wireless communication system discontinuous monitoring downlink control channel in subscriber equipment: receive discontinuous reception (DRX) start offset from base station, to be used to the first DRX cycle and the second DRX cycle, and meeting for the first condition of the first DRX cycle or for the subframe place of the second condition of the second DRX cycle, start and open duration timer, a DRX skew of wherein using in first condition is the DRX start offset based on receiving from base station, and it is the remainder of the DRX start offset based on receiving from base station after the modulo operation divided by the second DRX cycle that the 2nd DRX wherein using in second condition is offset.
On the other hand, for comprising in the method for wireless communication system discontinuous monitoring downlink control channel in subscriber equipment: receive discontinuous reception (DRX) start offset from base station, to be used to DRX cycle, and it is { DRX start offset } the MOD{DRX cycle by the DRX calculations of offset of using in DRX cycle }.
On the other hand, for comprising in the method for wireless communication system discontinuous monitoring downlink control channel in subscriber equipment: receive discontinuous reception (DRX) start offset from base station, to be used to long DRX cycle, and be the short DRX cycle of { DRX start offset } MOD{ by the DRX calculations of offset of using in short DRX cycle }.
On the other hand, for comprising in the method for wireless communication system discontinuous monitoring downlink control channel in subscriber equipment: determine during the transfer of data from base station to subscriber equipment it is to use short DRX cycle or long DRX cycle; If use short DRX cycle between data transfer period, meet { (System Frame Number) X10+ subframe numbers } short DRX cycle of MOD{=short the DRX cycle of { DRX start offset } MOD{ subframe place, start open duration timer; And if between data transfer period, use long DRX cycle, meeting { (System Frame Number) X10+ subframe numbers } long DRX cycle of MOD{ }=subframe the place of { DRX start offset }, startup unlatching duration timer.
On the other hand, for comprising at the device of wireless communication system discontinuous monitoring downlink control channel in subscriber equipment: radio-frequency transmitter, this radio-frequency transmitter receives discontinuous reception (DRX) start offset from base station, to be used to the first DRX cycle and the second DRX cycle; Processor, this processor is meeting for the first condition of the first DRX cycle or for the subframe place of the second condition of the second DRX cycle, start and open duration timer, wherein, a DRX skew of using in first condition is the DRX start offset based on receiving from base station, and the 2nd DRX skew of wherein using in second condition is DRX start offset based on receiving from the base station remainder after the modulo operation divided by the second DRX cycle; And memory, the one DRX skew of this memory stores and the 2nd DRX skew.
On the other hand, for comprising at the device of wireless communication system discontinuous monitoring downlink control channel in subscriber equipment: radio-frequency transmitter, this radio-frequency transmitter receives DRX start offset from base station, to be used to long DRX cycle; Processor, this processor is the short DRX cycle of { DRX start offset } MOD{ by the DRX calculations of offset of using in short DRX cycle }; And memory, the DRX skew that this memory stores is calculated.
On the other hand, for comprising at the device of wireless communication system discontinuous monitoring downlink control channel in subscriber equipment: radio-frequency transmitter, this radio-frequency transmitter receives discontinuous reception (DRX) start offset from base station; Processor, when using short DRX cycle, this processor calculates DRX skew; And memory, the DRX skew that this memory stores is calculated.
On the other hand, for the method for discontinuous control downlink control channel in subscriber equipment at wireless communication system, comprise: from base station, receive short DRX start offset and long DRX start offset; Determine that during the transfer of data from base station to subscriber equipment by data, determining is to use short DRX cycle or long DRX cycle; If data are being used to short DRX cycle between the data transfer period from base station to subscriber equipment, so meeting { (system frame number number) X10+ number of subframes number } short DRX cycle of MOD{ }=subframe the place of { short DRX start offset }, duration timer is opened in initial startup; And if between data transfer period, use long DRX cycle, meeting { (System Frame Number) X10+ subframe numbers } long DRX cycle of MOD{ so }=subframe the place of { long DRX start offset }, startup unlatching duration timer.
On the other hand, for comprising at the device of discontinuous monitoring downlink control channel in subscriber equipment of wireless communication system: less radio-frequency receiver receiver, this less radio-frequency receiver machine receives short DRX start offset and long DRX start offset from base station, and processor, this processor determines during the transfer of data from base station to subscriber equipment by data it is to use short DRX cycle or long DRX cycle, if data are being used to short DRX cycle between the data transfer period from base station to subscriber equipment, meeting { (system frame number number) X10+ number of subframes number } short DRX cycle of MOD{ }=subframe the place of { short DRX start offset }, start and open duration timer, if and if between data transfer period use long DRX cycle, meeting { (system frame number number) X10+ number of subframes number } long DRX cycle of MOD{ }=subframe the place of { long DRX start offset }, start and open duration timer.
It should be understood that above-outlined of the present invention and detailed description are below exemplary and explanatory, aim to provide the of the present invention further explanation to as claimed in claim.
[beneficial effect]
Method of the present invention does not change the size that sends to the message of UE for DRX operation from eNB, thereby saves Radio Resource.Or rather, eNB sends single value, and single DRX start offset is to UE.Therefore, signaling is efficient.
Advantage of the present invention is not limited to as described above, and those skilled in the art will more clearly understand other advantages from below describe.
Accompanying drawing explanation
Accompanying drawing is included to provide a further understanding of the present invention, and accompanying drawing illustrates embodiments of the invention, and together with the description for explaining principle of the present invention.
In the accompanying drawings:
Fig. 1 shows according to the network configuration of the universal mobile telecommunications system of the evolution of correlation technique (E-UMTS).
Fig. 2 shows according to the network configuration of the universal terrestrial access network of the evolution of correlation technique (E-UTRAN).
Fig. 3 is the control plane of Radio interface protocols and the configuration of user plane between E-UTRAN and subscriber equipment (UE) according to correlation technique.
Fig. 4 shows discontinuous reception (DRX) cycle.
Fig. 5 shows according to the flow chart of the DRX operation of exemplary embodiment of the present invention.
Fig. 6 is the block diagram of the equipment for implementing according to an exemplary embodiment of the present DRX method, and it can be applied to eNB or UE.
Embodiment
With reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.The detailed description of doing at hereinafter with reference accompanying drawing is intended to explain exemplary embodiment of the present invention, but not the embodiment that only can implement according to the present invention is shown.
Detailed description below comprises specific detail, to provide thorough understanding of the present invention.But, it will be apparent to those skilled in the art that and under the condition that there is no these specific detail, also can implement the present invention.For example, although following description concentrates in particular term, these terms should not be understood to limitation of the invention.These terms can substitute with other terms of identical meanings.Likely all, will refer to same or analogous parts with identical Reference numeral in the accompanying drawings.
Technology described below, equipment and system can be applied to various wireless access technologys, comprise code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), OFDM (OFDMA) and single-carrier frequency division multiple access (SC-FDMA).
Can implement CDMA with the wireless technology such as general land wireless access (UTRA) or CDMA2.Can implement TDMA with the wireless technology such as such as global system for mobile communications (GSM), GPRS (GPRS), enhanced data rates for gsm evolution (EDGE).Can implement OFDMA with wireless technologys such as the UTRA (E-UTRA) such as Institute of Electrical and Electric Engineers (IEEE) 802.11 (Wireless Fidelity (Wi-Fi)), IEEE802.16 (worldwide interoperability for microwave access (WiMAX)), IEEE 802.20, evolution.UTRA is the part of universal mobile telecommunications system (UMTS), and third generation partner program (3GPP) Long Term Evolution (LTE) is the part of using the E-UMTS of E-UTRA.3GPP LTE is applied to OFDMA down link and SC-FDMA is applied to up link.
Will be described below discontinuous reception (DRX) method to set up according to exemplary embodiment of the present invention.The DRX function that subscriber equipment (UE) can discontinuous reception physical downlink control channel (PDCCH) can be realized by Radio Resource control (RRC) signaling.
Fig. 4 shows DRX cycle.As shown in Figure 4, UE monitors PDCCH in unlatching duration section.DRX cycle specifies the periodicity of opening the duration to repeat, and is the period of possible deexcitation after this unlatching duration.
Fig. 5 shows the DRX operation according to exemplary embodiment of the present invention.As shown in Figure 5, in step S510, UE receives DRX information by RRC signaling from the Node B (eNB) of evolution.In step S520, the DRX information and executing DRX operation of UE based on receiving.In form 1 below, list DRX information.
| DRX configuration | The information that parameter provides |
| Open duration timer | Timer value |
| DRX deexcitation timer | Timer value |
| DRX resends timer | Timer value |
| Long DRX cycle start offset | For the initial skew of computing cycle |
| Short DRX cycle | Short-period length |
| DRX short cycle timer | Timer value |
Opening duration timer is the part of DRX cycle.Opening duration timer, to specify in UE during it be the number that the continuous T TI of PDCCH is monitored in possible distribution.DRX deexcitation timer specify in successfully decoded for after the PDCCH of UE indication initial user transfer of data during it UE monitor the number of the continuous T TI of PDCCH.Once resending timer, DRX specify UE to expect to resend, the number of the continuous T TI of UE monitoring PDCCH.DRX short cycle timer is parameter, and this parameter specifies in after DRX deexcitation timer expired, and UE follows the number of the continuous T TI of short DRX cycle.
During arriving the transfer of data of UE, within the short non-transfer of data period intermittently, short DRX cycle helps UE conservation of power.To be sent in the period of UE not having data to be sent maybe, long DRX cycle helps UE conservation of power.For internet browsing, as example, short DRX cycle can be corresponding with the period of downloading web pages, can obtain instantaneous electric power and save in this period.On the other hand, long DRX cycle can and user's adopting consecutive click chemical reaction between period corresponding, that is, the click with user to one page and it is corresponding to the time between the click of another page can be saved electric power owing to there is no data in this period.Therefore, short DRX cycle is shorter than long DRX cycle.
ENB determines that it will be in each TTI sends the UE of data to it, and notifies this UE to exist its data of guiding by PDCCH.But multiple UE with identical DRX cycle wake up normally undesirable in the identical period.When during by all UE of direct data, may not schedule information be sent to all UE on PDCCH in the identical period.
For example, if there are 10 UE, i.e. UE1 to UE10, and DRX cycle is 10ms, the each every 10ms monitoring PDCCH in 10 UE, to determine whether its data of guiding.If UE starts to carry out DRX when time T=0ms, their all waking up so, and attempt receiving PDCCH at 0ms, 10ms, 20ms etc.In this case, when eNB during the time period between 11ms and 19ms receives for the data of all 10 UE, it can exist its data of guiding at time 20ms notice UE.But, because PDCCH can transport limited amount schedule information, so eNB may not notify some UE to exist their data.Therefore, eNB utilizes skew to distribute the PDCCH monitoring period of UE.
As example, UE1 can be wake up and attempt receiving PDCCH at 1ms, 11ms and 21ms by skew, and UE2 can be by skew for waking up and attempt receiving PDCCH at 2ms, 12ms and 22ms.These skews are called as DRX start offset.ENB notifies the single value of the DRX start offset that given UE represents this UE.Therefore, the expression of UE based on receiving, for the single value of the DRX start offset of this UE, determines when start to monitor PDCCH and how to monitor continually PDCCH.For example, long DRX cycle can be 10,20,32,40,64,80,128,160,256,320,512,640,1024,1280, one of 2048 and 2560 (take ms as unit), and short DRX cycle can be 2,5,8,16,20,32,40,64,80, one of 128,160,256,320,512 and 640 (take ms as unit).
But, if eNB, based on single DRX cycle, such as long DRX cycle, determines DRX start offset, existing problems so.For example, suppose that long DRX cycle is configured to 2560ms, and short DRX cycle is configured to 512ms, the available DRX start offset based on long DRX cycle is 0 to 2559.If eNB is used as DRX start offset by one of value 0 to 511, the operation of describing in table 2 below so,, for opening the service conditions of duration timer, should be no problem.
Table 2
But if eNB is used as DRX start offset by one of value 512 to 2559, [(SFNx10)+subframe numbers] will always be less than 512 divided by the remainder of short DRX cycle so.Therefore,, by the subframe not meeting the following conditions, this condition equals DRX start offset for [(SFNx10)+subframe numbers] divided by the remainder of short DRX cycle.As a result, even if eNB arranges short DRX, UE can not be used short DRX.Will be described below for solution to the problems described above.
The first exemplary embodiment
According to the first exemplary embodiment of the present invention, when using short DRX cycle, UE application is for revising the operation of the DRX start offset receiving from eNB.This guarantees that the subframe meeting the following conditions exists always, and this condition is that [(SFNx10)+subframe numbers] equals amended DRX start offset divided by the remainder of short DRX cycle.The example that is used for the operation of revising DRX start offset can be modulo operation.Particularly, modulo operation can be used to calculate the starting point of short DRX cycle.Especially, UE carries out modulo operation for the DRX start offset receiving from eNB, and carrying out modulo operation use value afterwards, to determine the starting point of opening duration timer in short DRX cycle.In this example, table 2 is modified to table 3, as shown below.
Table 3
Said method does not change the size that sends to the message of UE from eNB, thereby saves wireless energy.Or rather, eNB sends single value, i.e. single DRX start offset, to UE.Therefore, signaling is efficient.
For example, if long DRX cycle is 2560ms, short DRX cycle is 512ms, and DRX start offset is 1000ms, and when using short DRX cycle, amended DRX deviant will become 488ms, i.e. 1000 moulds 512 so.On the other hand, when using long DRX cycle, DRX start offset will remain 1000ms.Although use single DRX start offset in the first exemplary embodiment, multiple DRX start offsets can be used to each DRX cycle, described in following the second exemplary embodiment of the present invention.
the second exemplary embodiment
In the second embodiment of the present invention, when eNB is UE when multiple DRX cycle is set, its notice UE is for the DRX start offset of each DRX cycle.When receiving DRX configuration information from eNB, especially when DRX configuration information is indicated multiple DRX cycle, UE, when calculating DRX cycle initial, is used for the DRX start offset of each DRX cycle and arranges.
For example, when eNB intends, for UE, the long DRX cycle of 2560ms and the short DRX cycle of 512ms are set, it additionally notifies UE to be used for the deviant of two DRX cycles.For example, eNB can order UE to use being 1000 DRX skew and being that 488 DRX is offset for short DRX for long DRX.UE use is subsequently DRX rank, i.e. short DRX cycle and long DRX cycle, and DRX start time point is calculated in the DRX receiving skew.
According to the second embodiment, table 2 is modified to table 4.Although send to the signaling of UE from eNB, will increase, said method has been eliminated the other calculating operation of carrying out in the first exemplary embodiment.
Table 4
Fig. 6 is that it is applicable to other equipment in eNB, UE or wireless communication system for implementing the block diagram of the equipment 60 of DRX method according to an exemplary embodiment of the present invention.As shown in Figure 6, equipment 60 comprises processor unit 61, memory cell 62, radio frequency (RF) unit 63, display unit 64 and user interface section 65.Processor unit 61 is responsible for physical interface protocol layer.Processor unit 61 provides control plane and user plane.Processor unit 61 also can be based on whether receiving single DRX start offset from base station to be used to short DRX cycle and long DRX cycle, as the first exemplary embodiment, or whether multiple DRX start offset is received, as the second exemplary embodiment, calculates DRX skew.Memory cell 62 is electrically connected to processor unit 61, and storage operation system, application and generic-document.If equipment 60 is UE, display unit 64 can show many information and can use the configurations such as liquid crystal display (LCD), Organic Light Emitting Diode (OLED).User interface section 65 can be configured by the combination of the known users such as such as keypad, touch-screen interface.RF unit 63 is electrically connected to processor unit 61, and sends or receive wireless signal.
From above describing and can understand, exemplary embodiment eNB according to the present invention arranges by efficient DRX, sends the signaling information of reduction.Therefore, improved the service efficiency of Radio Resource.
Above-described exemplary embodiment is the combination of element of the present invention and feature.Except as otherwise noted, these elements or feature can be considered to optionally.Can put into practice each element or feature and need not with other elements or Feature Combination.In addition, embodiments of the invention can be constructed by the part in composition element and/or feature.Can rearrange the operating sequence of describing in an embodiment of the present invention.Some structures of any one embodiment can be included in another embodiment, and can be replaced by the relative configurations of another embodiment.It will be apparent for a person skilled in the art that, in claims, do not have the clear and definite claim of quoting each other can be combined as exemplary embodiment of the present invention, or can be included as new claim by the subsequent modification after submitting the application to.
Term " UE " can replace by term " mobile radio station (MS) " " subscriber station (SS) " " mobile subscriber station (MSS) " " mobile terminal " etc.UE can be personal digital assistant (PAD), cell phone, personal communication service (PCS) phone, global system for mobile communications (GSM) phone, Wideband Code Division Multiple Access (WCDMA) (WCDMA) phone, mobile broadband system (MBS) phone etc.
It will be understood by those skilled in the art that, do not departing under the situation of the spirit and scope of the present invention, can carry out various modifications and change to the method for monitoring downlink control channel in subscriber equipment of the present invention.Therefore, this invention is intended to cover modification of the present invention and change, as long as they fall in the scope of claims and equivalent thereof.
[embodiments of the present invention]
For realizing preferred forms of the present invention, various embodiment are being described.
By combine assembly of the present invention and feature with particular form, provide above-described embodiment.Unless otherwise expressly stated, assembly of the present invention or feature should be considered optionally.Can implement this assembly or feature and not with other assemblies or Feature Combination.By combining some assemblies and/or feature, also can provide embodiments of the invention.Operating sequence in the embodiment of the present invention of foregoing description can be changed.Some assemblies or the feature of an embodiment can be included in another embodiment, or can replace by the corresponding assembly of another embodiment or feature.It is evident that do not have clear and definite dependent claims each other can be combined to provide embodiment, or can increase new claim by modification after the application submits to.
By hardware, firmware, software or its any combination, can implement embodiments of the invention.By under hardware implementation situation of the present invention, by one or more application-specific integrated circuit (ASIC)s (ASIC), digital signal processor (DSP), digital signal processing appts (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor etc., can implement embodiments of the invention.
By under firmware or implement software situation of the present invention, with the form such as module, process, function of carrying out above-mentioned feature or operation, can implement embodiments of the invention.Software code can be stored in memory cell, to be executed by processor.Memory cell can be positioned at inside or the outside of processor, and can be by various any means known and processor transmission data.
It is apparent to those skilled in the art that and do not departing under the situation of spirit of the present invention and essential characteristic, can embody the present invention with other particular forms setting forth except this place.Therefore, foregoing description is taken one thing with another as exemplary and nonrestrictive.Should determine scope of the present invention by the reasonable dismissal of claims, and the institute falling in equivalent scope of the present invention changes and is included in scope of the present invention.
[industrial applicability]
The present invention can be used in subscriber equipment, base station or other equipment in mobile radio system.
Claims (8)
- In wireless communication system in subscriber equipment for a method for discontinuous monitoring downlink control channel, described method comprises:From base station, receive discontinuous reception (DRX) start offset, to be used to the first DRX cycle and the second DRX cycle; AndMeeting for the first condition of described the first DRX cycle or for the subframe place of the second condition of described the second DRX cycle, start and open duration timer,Wherein, a DRX skew of using in described first condition is the described DRX start offset based on receiving from described base station, andWherein, the 2nd DRX skew of using in described second condition is { DRX start offset } MOD{ the second DRX cycle } result of calculation, here, { DRX start offset } represents the value of the described DRX start offset receiving from described base station, { the second DRX cycle } represents the value of described the second DRX cycle, and MOD represents modulo operation.
- 2. method according to claim 1, wherein, described the first DRX cycle is longer than described the second DRX cycle.
- 3. method according to claim 1, wherein, when using described the first and second DRX cycle, the original position of the activation period in the described downlink control channel of monitoring is determined respectively in described the first and second DRX skews.
- 4. method according to claim 1, wherein, one of employing code division multiple access, frequency division multiple access, time division multiple access, OFDM and single carrier-frequency division multiple access are carried out discontinuous channel monitoring.
- In wireless communication system in subscriber equipment for a device for discontinuous monitoring downlink control channel, described device comprises:Radio-frequency transmitter, described radio-frequency transmitter receives discontinuous reception (DRX) start offset from base station, to be used to the first DRX cycle and the second DRX cycle;Processor, described processor starts and opens duration timer meeting for the first condition of described the first DRX cycle or for the subframe place of the second condition of described the second DRX cycle;Wherein, a DRX skew of using in described first condition is the described DRX start offset based on receiving from described base station, andWherein, the 2nd DRX skew of using in described second condition is { DRX start offset } MOD{ the second DRX cycle } result of calculation, here, { DRX start offset } represents the value of the described DRX start offset receiving from described base station, { the second DRX cycle } represents the value of described the second DRX cycle, and MOD represents modulo operation; AndMemory, a DRX skew and described the 2nd DRX are offset described in described memory stores.
- 6. device according to claim 5, wherein, described the first DRX cycle is longer than described the second DRX cycle.
- 7. device according to claim 5, wherein, when using described the first and second DRX cycle, the original position of the activation period in the described downlink control channel of monitoring is determined respectively in described the first and second DRX skews.
- 8. device according to claim 5, one of employing code division multiple access, frequency division multiple access, time division multiple access, OFDM and single carrier-frequency division multiple access are carried out discontinuous channel monitoring.
Applications Claiming Priority (5)
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| US61/112,154 | 2008-11-06 | ||
| KR1020090100804A KR101642309B1 (en) | 2008-11-06 | 2009-10-22 | A method for monitoring a downlink control channel |
| KR10-2009-0100804 | 2009-10-22 | ||
| PCT/KR2009/006512 WO2010053308A2 (en) | 2008-11-06 | 2009-11-06 | Method for monitoring downlink control channel in user equipments |
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| CN102273250A CN102273250A (en) | 2011-12-07 |
| CN102273250B true CN102273250B (en) | 2014-05-07 |
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| CN200980153310.4A Active CN102273250B (en) | 2008-11-06 | 2009-11-06 | Method for monitoring downlink control channel in user equipments |
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| US (1) | US20100110897A1 (en) |
| EP (1) | EP2351407B1 (en) |
| JP (1) | JP5209797B2 (en) |
| KR (1) | KR101642309B1 (en) |
| CN (1) | CN102273250B (en) |
| WO (1) | WO2010053308A2 (en) |
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| WO2010053308A3 (en) | 2010-08-12 |
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